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1# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2# Most of this file is copied from tools/lib/traceevent/Makefile
3
4LIBBPF_VERSION := $(shell \
5 grep -oE '^LIBBPF_([0-9.]+)' libbpf.map | \
6 sort -rV | head -n1 | cut -d'_' -f2)
7LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(LIBBPF_VERSION)))
8
9MAKEFLAGS += --no-print-directory
10
11# This will work when bpf is built in tools env. where srctree
12# isn't set and when invoked from selftests build, where srctree
13# is a ".". building_out_of_srctree is undefined for in srctree
14# builds
15ifndef building_out_of_srctree
16srctree := $(patsubst %/,%,$(dir $(CURDIR)))
17srctree := $(patsubst %/,%,$(dir $(srctree)))
18srctree := $(patsubst %/,%,$(dir $(srctree)))
19#$(info Determined 'srctree' to be $(srctree))
20endif
21
22INSTALL = install
23
24# Use DESTDIR for installing into a different root directory.
25# This is useful for building a package. The program will be
26# installed in this directory as if it was the root directory.
27# Then the build tool can move it later.
28DESTDIR ?=
29DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
30
31include $(srctree)/tools/scripts/Makefile.arch
32
33ifeq ($(LP64), 1)
34 libdir_relative = lib64
35else
36 libdir_relative = lib
37endif
38
39prefix ?= /usr/local
40libdir = $(prefix)/$(libdir_relative)
41man_dir = $(prefix)/share/man
42man_dir_SQ = '$(subst ','\'',$(man_dir))'
43
44export man_dir man_dir_SQ INSTALL
45export DESTDIR DESTDIR_SQ
46
47include $(srctree)/tools/scripts/Makefile.include
48
49# copy a bit from Linux kbuild
50
51ifeq ("$(origin V)", "command line")
52 VERBOSE = $(V)
53endif
54ifndef VERBOSE
55 VERBOSE = 0
56endif
57
58FEATURE_USER = .libbpf
59FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx
60FEATURE_DISPLAY = libelf bpf
61
62INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
63FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
64
65check_feat := 1
66NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
67ifdef MAKECMDGOALS
68ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
69 check_feat := 0
70endif
71endif
72
73ifeq ($(check_feat),1)
74ifeq ($(FEATURES_DUMP),)
75include $(srctree)/tools/build/Makefile.feature
76else
77include $(FEATURES_DUMP)
78endif
79endif
80
81export prefix libdir src obj
82
83# Shell quotes
84libdir_SQ = $(subst ','\'',$(libdir))
85libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
86
87OBJ = $@
88N =
89
90LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
91LIB_FILE = libbpf.a libbpf.so*
92PC_FILE = libbpf.pc
93
94# Set compile option CFLAGS
95ifdef EXTRA_CFLAGS
96 CFLAGS := $(EXTRA_CFLAGS)
97else
98 CFLAGS := -g -Wall
99endif
100
101ifeq ($(feature-libelf-mmap), 1)
102 override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
103endif
104
105ifeq ($(feature-reallocarray), 0)
106 override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
107endif
108
109# Append required CFLAGS
110override CFLAGS += $(EXTRA_WARNINGS)
111override CFLAGS += -Werror -Wall
112override CFLAGS += -fPIC
113override CFLAGS += $(INCLUDES)
114override CFLAGS += -fvisibility=hidden
115override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
116
117# flags specific for shared library
118SHLIB_FLAGS := -DSHARED
119
120ifeq ($(VERBOSE),1)
121 Q =
122else
123 Q = @
124endif
125
126# Disable command line variables (CFLAGS) override from top
127# level Makefile (perf), otherwise build Makefile will get
128# the same command line setup.
129MAKEOVERRIDES=
130
131all:
132
133export srctree OUTPUT CC LD CFLAGS V
134include $(srctree)/tools/build/Makefile.include
135
136SHARED_OBJDIR := $(OUTPUT)sharedobjs/
137STATIC_OBJDIR := $(OUTPUT)staticobjs/
138BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
139BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
140VERSION_SCRIPT := libbpf.map
141
142LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
143LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
144PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
145
146GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
147 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
148 awk '/GLOBAL/ && /DEFAULT && !/UND/ {print $$8}' | \
149 sort -u | wc -l)
150VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \
151 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
152
153CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
154
155CXX_TEST_TARGET = $(OUTPUT)test_libbpf
156
157ifeq ($(feature-cxx), 1)
158 CMD_TARGETS += $(CXX_TEST_TARGET)
159endif
160
161TARGETS = $(CMD_TARGETS)
162
163all: fixdep
164 $(Q)$(MAKE) all_cmd
165
166all_cmd: $(CMD_TARGETS) check
167
168$(BPF_IN_SHARED): force elfdep bpfdep
169 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
170 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
171 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
172 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
173 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
174 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf_common.h' differs from latest version at 'include/uapi/linux/bpf_common.h'" >&2 )) || true
175 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
176 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
177 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
178 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
179 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
180 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_link.h' differs from latest version at 'include/uapi/linux/if_link.h'" >&2 )) || true
181 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
182 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
183 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true
184 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
185
186$(BPF_IN_STATIC): force elfdep bpfdep
187 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
188
189$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
190
191$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED)
192 $(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
193 -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
194 @ln -sf $(@F) $(OUTPUT)libbpf.so
195 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
196
197$(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
198 $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
199
200$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
201 $(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@
202
203$(OUTPUT)libbpf.pc:
204 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
205 -e "s|@LIBDIR@|$(libdir_SQ)|" \
206 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
207 < libbpf.pc.template > $@
208
209check: check_abi
210
211check_abi: $(OUTPUT)libbpf.so
212 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
213 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \
214 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
215 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
216 "Please make sure all LIBBPF_API symbols are" \
217 "versioned in $(VERSION_SCRIPT)." >&2; \
218 readelf -s --wide $(OUTPUT)libbpf-in.o | \
219 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
220 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$8}'| \
221 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
222 readelf -s --wide $(OUTPUT)libbpf.so | \
223 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
224 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
225 diff -u $(OUTPUT)libbpf_global_syms.tmp \
226 $(OUTPUT)libbpf_versioned_syms.tmp; \
227 rm $(OUTPUT)libbpf_global_syms.tmp \
228 $(OUTPUT)libbpf_versioned_syms.tmp; \
229 exit 1; \
230 fi
231
232define do_install_mkdir
233 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
234 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
235 fi
236endef
237
238define do_install
239 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
240 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
241 fi; \
242 $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
243endef
244
245install_lib: all_cmd
246 $(call QUIET_INSTALL, $(LIB_TARGET)) \
247 $(call do_install_mkdir,$(libdir_SQ)); \
248 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
249
250install_headers:
251 $(call QUIET_INSTALL, headers) \
252 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
253 $(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
254 $(call do_install,btf.h,$(prefix)/include/bpf,644); \
255 $(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \
256 $(call do_install,xsk.h,$(prefix)/include/bpf,644);
257
258install_pkgconfig: $(PC_FILE)
259 $(call QUIET_INSTALL, $(PC_FILE)) \
260 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
261
262install: install_lib install_pkgconfig
263
264### Cleaning rules
265
266config-clean:
267 $(call QUIET_CLEAN, config)
268 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
269
270clean:
271 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(TARGETS) $(CXX_TEST_TARGET) \
272 *.o *~ *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) .*.d .*.cmd \
273 *.pc LIBBPF-CFLAGS $(SHARED_OBJDIR) $(STATIC_OBJDIR)
274 $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
275
276
277
278PHONY += force elfdep bpfdep
279force:
280
281elfdep:
282 @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
283
284bpfdep:
285 @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
286
287# Declare the contents of the .PHONY variable as phony. We keep that
288# information in a variable so we can use it in if_changed and friends.
289.PHONY: $(PHONY)